Cycling’s health payoff outweighs city smog, so traffic is the risk to manage

Key takeaways

• In a seven-city European survey, e-bike riders reported about as much weekly physical activity as regular cyclists, partly because their trips were longer².
• U.S. emergency rooms treated an estimated 59,200 e-bike injuries in 2024, up from about 6,300 a year in 2017 to 2021, and more than half of e-bike deaths involved a motor vehicle¹.
• In a modeling study, a half-hour daily ride still came out ahead on health even in Delhi, which had the worst air of any city in a World Health Organization database⁹.
• A review of 40 studies linked helmets to roughly 69% lower odds of serious head injury, though critics say the true effect may be smaller⁶⁷.
• In a 2018 survey of 2,774 male cyclists, their erections were no worse than those of swimmers or runners, but low handlebars raised the odds of numbness and saddle sores¹⁰.

In 2024, U.S. emergency rooms treated an estimated 59,200 injuries from electric bikes. That’s roughly nine times the yearly average from 2017 to 2021, according to an April 2026 report by staff at the U.S. Consumer Product Safety Commission (CPSC)¹.

That number gets the headlines, but here’s one that doesn’t. In a survey of more than 10,000 people in seven European cities, e-bike riders reported about as much weekly physical activity as people on regular bikes². Their motors did part of the work, but they rode farther, so the exercise added up².

Both facts are true, and together they sum up cycling. It’s one of the easiest ways to build exercise into a day, with or without a motor. Its biggest risk isn’t your heart or your lungs: it’s the cars around you.

This guide covers what the health research shows, whether e-bikes count, how worried to be about city air, helmets and saddles, and a starter plan for indoor, path or road riding.

Bike commuters live longer in studies, and healthier people may also ride more

The classic study comes from Copenhagen. A team led by Lars Bo Andersen tracked more than 30,000 adults, ranging in age from 20 to 93, and published the results in the Archives of Internal Medicine in 2000³. Close to 15,000 of them pedaled to work, about three hours a week on average³.

Those who didn’t bike to work had a 39% higher death rate, according to a summary of the study by Dr. Adrian Davis for Travelwest, a travel information service in the west of England³. The gap held after the researchers allowed for leisure-time exercise, smoking, blood pressure, cholesterol, weight and self-rated health³.

A 2017 British study of 80,306 adults found a similar pattern. People who reported cycling had a 15% lower risk of dying from any cause during the study⁴. Cycling wasn’t clearly linked with fewer deaths from heart and blood vessel disease, though⁴.

Our article on staying healthy while working full time covers a third large study, of British bike commuters, so we won’t repeat it here.

All three are observational studies, which track what people already do. People who ride may be healthier, fitter or better off to begin with, and statistics can’t remove every difference. Still, the results line up across countries.

E-bikes still give you a workout, especially if they replace a car or bus

The European survey, part of a project called PASTA, ran in Antwerp, Barcelona, London, Örebro, Rome, Vienna and Zurich². Researchers measured activity in MET-minutes, a unit that multiplies effort by time.

E-bike riders logged about 4,463 MET-minutes a week, compared with 4,085 for regular cyclists, a similar level². Their average e-bike trip was 9.4 kilometers, about 5.8 miles, while cyclists’ bike trips averaged 4.8 kilometers².

What the e-bike replaced made the biggest difference²:

• People who switched from a car gained about 550 MET-minutes a week.
• People who switched from buses or trains gained about 800.
• People who switched from a regular bike lost about 200, a small drop, because they rode farther.

E-bike riders in the survey were older, averaging 48 years versus 41 for regular cyclists². One plausible reading, though the survey can’t prove it: a motor may bring riding back within reach as people age.

The study has limits. Riders reported their own activity, the survey was a snapshot rather than a long-term follow-up, and people chose their own bikes². The European Commission funded it².

City air rarely cancels the benefits

Breathing harder in traffic means breathing in more exhaust, so does pollution erase the gain?

In 2016, an international team led by Marko Tainio put numbers on that question⁹. They used fine particle pollution, called PM2.5, and modeled long-term risk of death.

At the average city pollution level in a World Health Organization database, more riding kept adding health benefit up to about 7 hours a day⁹. For a half-hour ride each day, pollution had to reach 95 micrograms per cubic meter before more riding stopped adding benefit. Fewer than 1% of cities in the database were that polluted⁹.

Even in Delhi, which topped the database for fine-particle pollution, a half hour a day still came out ahead. Harms only matched benefits at about 45 minutes a day⁹.

The model covered long-term exposure only, not short spikes such as wildfire smoke days, and it didn’t count illnesses short of death⁹. Public and charity funders paid for the work, and the authors declared no conflicts⁹.

For most U.S. riders, the practical answer is to keep riding. On smoke or pollution alert days, an indoor bike lets you keep the habit without breathing hard in smoky air.

Traffic is the main danger, and more than half of cyclist deaths happen in the dark

The National Highway Traffic Safety Administration (NHTSA) counted 1,103 cyclists killed on U.S. roads in 2024⁵. That was down 6% from 1,173 in 2023, but up from 829 in 2015⁵.

The details point to what you can control⁵:

• Darkness: 52% of cyclist deaths happened in the dark. The deadliest hours were 6 p.m. to 9 p.m.
• Location: 60% happened away from intersections, and 81% were in urban areas.
• Alcohol: Alcohol was involved in 33% of fatal crashes, for the driver, the rider or both.
• Age: The average cyclist killed was 48, and 237 were 65 or older. Men made up 87% of deaths.

E-bikes follow the same pattern. Of 310 e-bike deaths CPSC staff identified from 2017 through 2024, 170 involved a collision with a motor vehicle¹. Seventy-five of the people who died were 65 or older¹. Battery fires caused 19 deaths¹.

Keep a few limits in mind. The CPSC report counts injuries without knowing how many miles people rode, and it doesn’t compare e-bikes with regular bikes¹. Recent death counts are likely to rise, because reports can take up to two years to arrive¹.

CPSC’s numbers also shift between reports. The agency revised its emergency-room sample in 2024 and reweighted earlier years¹. That’s why a 2024 statement by Commissioner Mary Boyle cited about 24,000 e-bike ER visits in 2022, while the 2026 report puts 2022 at 26,800¹¹⁵.

Don’t add CPSC’s deaths to NHTSA’s, either. NHTSA counts only crashes that involve a motor vehicle on a public road⁵. CPSC gathers reports from death certificates, medical examiners, news stories and other sources, including falls and fires, and calls its counts anecdotal rather than national estimates¹.

Helmets cut serious head injuries, though experts debate by how much

NHTSA puts it plainly: “A helmet is the single most effective way to prevent head injury resulting from a bicycle crash”⁵.

The largest review of the question comes from Jake Olivier and Prudence Creighton of UNSW Sydney. They pooled 40 studies of about 64,000 injured cyclists, published in the International Journal of Epidemiology⁶. Helmet wearers had about 51% lower odds of head injury, 69% lower odds of serious head injury and 65% lower odds of fatal head injury. Face injuries were 33% less likely⁶⁷.

Not everyone accepts those numbers. In a 2017 critique in the journal World Transport Policy & Practice, Colin Clarke argued that helmeted and unhelmeted riders differ in ways that affect both how often they crash and how often they hurt their heads⁷. That’s a fair point about observational data.

A separate study points in the same direction, though. Canadian researchers used a coroner’s review of 129 accidental cycling deaths in Ontario from 2006 to 2010⁸. Riders without helmets had about three times the odds of dying from a head injury rather than another injury⁸. Most of those who died were adults, outside Ontario’s helmet law for riders under 18⁸.

The size of the effect is debated, but the direction isn’t. A properly fitted helmet is cheap insurance⁵.

Saddle worries: numbness is real, but erections held up in a big survey

Many men have heard that cycling causes erectile dysfunction, and a 2018 study from the University of California, San Francisco, tested that worry¹⁰. Researchers led by urologist Benjamin Breyer surveyed 2,774 male cyclists, 539 swimmers and 789 runners¹⁰.

On measures of sexual and urinary function, the cyclists scored about the same as the swimmers and runners. Men who rode hardest had better erection scores than those who rode least¹⁰.

Cycling wasn’t problem-free. Cyclists were more likely to have urethral strictures, a narrowing of the tube that carries urine¹⁰. Handlebars set lower than the saddle raised the odds of genital numbness and saddle sores. Standing up for more than 20% of the ride lowered the odds of numbness¹⁰.

In a 2020 article for urologists, Breyer and a medical student co-author recommended a professional bike fit as probably the most important step against numbness. They also advised keeping handlebars at least level with the saddle¹¹. Keep in mind that Breyer led the original survey. The article also cites a lab study in which shock-absorbing seat posts cut pressure on the perineum, the area between the legs, by 57% to 59%¹¹.

The survey covered men only, so it can’t speak to women riders. Numbness that lingers after rides, trouble urinating or blood in the urine deserve a visit to a clinician.

What the evidence shows, rated

Claim	What studies found	Rating
Regular cycling helps you live longer	Lower death rates in large observational studies in Denmark and Britain; no long-term trials34	Promising but early
E-bikes count as exercise	Similar weekly activity to regular cyclists in one self-reported survey2	Promising but early
Helmets prevent serious head injury	40 observational studies plus coroner data; effect size debated678	Strong evidence
City air pollution cancels cycling’s benefits	Benefits win except at pollution levels rare worldwide, in a modeling study9	Evidence says no (for most cities)
Cycling causes erectile dysfunction	No worse sexual function than swimmers or runners in a large survey; two other large studies, cited by the survey team, agree1011	Evidence says no
Level handlebars and standing up cut saddle numbness	Lower odds of numbness with both in one survey; no trials1011	Promising but early

A start-cycling plan for indoor, path or road riders

Check with a clinician first if you have heart, kidney or metabolic disease such as diabetes. Widely used American College of Sports Medicine (ACSM) screening guidance says inactive people without those conditions or symptoms don’t need a doctor’s clearance before they start¹³. Begin gently, as the plan below does. Stop and get checked if you notice chest discomfort, unusual breathlessness, dizziness or fainting, a pounding or irregular heartbeat, ankle swelling or leg cramps on short walks¹³¹⁴.

Judge effort by feel. On a 0-to-10 scale, 3 to 4 means you could chat easily. At 5 to 6, you can talk in sentences but not sing. At 7, you can say only a few words at a time.

Pick one column and ride three days a week. This plan is our own design, not a tested program.

Weeks	Indoor bike	Path or trail	Road
1–2	10 to 15 minutes, effort 3–4	20 to 30 minutes on a flat, paved path, effort 3–4	Practice starting, stopping, signaling and looking over your shoulder in an empty parking lot
3–4	20 minutes: 5 easy, 10 at effort 5–6, 5 easy	30 to 40 minutes, adding one gentle hill	20 to 30 minutes on quiet streets, such as a weekend morning
5–6	30 minutes, with 4 one-minute pushes at effort 7 and 2 easy minutes between	45 minutes at a steady 5–6	30 to 45 minutes on a planned route with bike lanes, in daylight

Progression rule: Move up when the current stage feels easy for two rides in a row. If you feel numb, sore in the saddle or stiff in the knees, hold steady and check your fit.

Bike fit basics. A professional fitting is the step Breyer’s team rates most important against numbness¹¹. Ask for handlebars at least level with the saddle¹¹, and stand up for short stretches during longer rides¹⁰.

Is an e-bike right for you? This guide is our own, built from the research above.

If this describes you	What to consider
You’d otherwise drive or take transit	A strong case: switchers from cars and transit gained the most activity2
You already ride a regular bike for fitness	Expect a small drop, about 200 MET-minutes a week, since switchers tend to ride farther2
Hills, distance or sore knees keep you off a bike	An e-bike can get you riding; ask a clinician first if you have heart disease13
You’re new to riding in traffic	Practice on paths first, since most e-bike deaths involved a motor vehicle1
You’ll charge it at home	Use only its own charger, stay nearby while it charges and never charge it while you sleep12

For many readers, cycling is natural health at its most practical. It runs on your own muscle, it can replace a car trip, and it puts you outside under open sky. An e-bike keeps that spirit for people whose joints or hills would otherwise keep them home.

Questions readers ask

The bottom line

Cycling and e-biking turn ordinary trips into exercise, and large studies link regular riding with a longer life, though healthier people may simply ride more. Everyday city air doesn’t cancel that benefit, and the saddle fears don’t hold up for most men.

The risk worth managing is traffic. Wear a helmet, light yourself up after dark, skip alcohol, choose quieter routes as you build skill, and give an e-bike’s battery the same care you’d give any charger in your home.

Related reading

• Swimming is easy on your joints, and being a safe swimmer takes five skills
• Full-time workers average under three free hours a workday, so build health into the rest
• Fitness trackers add steps, but their calorie counts are rough guesses
• Some healthy habits clash with your medicines, so check these goals first

Sources

1. Tark J, U.S. Consumer Product Safety Commission staff. “Micromobility Products-Related Deaths, Injuries, and Hazard Patterns: 2017–2024.” April 2026. cpsc.gov
2. Castro A, Gaupp-Berghausen M, Dons E, et al. “Physical activity of electric bicycle users compared to conventional bicycle users and non-cyclists: Insights based on health and transport data from an online survey in seven European cities.” Transportation Research Interdisciplinary Perspectives, 2019;1:100017. ora.ox.ac.uk
3. Andersen LB, Schnohr P, Schroll M, Hein HO. “All-cause mortality associated with physical activity during leisure time, work, sports, and cycling to work.” Archives of Internal Medicine, 2000;160:1621–1628. Summarized in Davis A, “Essential Evidence No. 4: Cycling and all-cause mortality,” Travelwest, December 20, 2008. travelwest.info
4. Oja P, Kelly P, Pedisic Z, et al. “Associations of specific types of sports and exercise with all-cause and cardiovascular-disease mortality: a cohort study of 80 306 British adults.” British Journal of Sports Medicine, 2017;51(10):812–817. research-information.bris.ac.uk
5. National Highway Traffic Safety Administration. “Bicyclists and Other Cyclists: 2024 Data.” Traffic Safety Facts, DOT HS 813 822, July 2026. crashstats.nhtsa.dot.gov
6. UNSW Sydney. “Jake Olivier presents largest review of bike injuries and helmet use” (on Olivier J, Creighton P, “Bicycle injuries and helmet use: a systematic review and meta-analysis,” International Journal of Epidemiology). September 22, 2016. unsw.edu.au
7. Clarke C (Colin). “Weaknesses with a Meta-Analysis Approach to Assessing Cycle Helmets.” World Transport Policy & Practice, 2017;22(4):8–35. trid.trb.org
8. Persaud N, Coleman E, Zwolakowski D, Lauwers B, Cass D. “Nonuse of bicycle helmets and risk of fatal head injury: a proportional mortality, case–control study.” CMAJ, 2012;184(17):E921. pubmed.ncbi.nlm.nih.gov
9. Tainio M, de Nazelle AJ, Götschi T, et al. “Can air pollution negate the health benefits of cycling and walking?” Preventive Medicine, 2016;87:233–236. acuresearchbank.acu.edu.au
10. EurekAlert (Elsevier). “Cycling does not damage men’s sexual or urinary functions” (on Awad MA, Breyer BN, et al., The Journal of Urology, 2018). January 11, 2018. eurekalert.org
11. Lee A, Breyer BN. “Bicycle riding: Good or bad for men’s health?” Urology Times, 2020;48(3). urologytimes.com
12. U.S. Consumer Product Safety Commission. “E-Scooter, E-Bike and Hoverboard Injuries and Deaths Are on the Rise.” Release 23-005, October 11, 2022. cpsc.gov
13. Green DJ. “New Preparticipation Guidelines Remove Barriers to Exercise.” American Council on Exercise, February 2018 (summarizing ACSM’s Guidelines for Exercise Testing and Prescription, 10th ed.). acefitness.org
14. Leeds Beckett University, Carnegie School of Sport. “Health screening guidance” (based on ACSM, 10th ed.). Version of July 2020. Www.Leedsbeckett.Ac.Uk
15. U.S. Consumer Product Safety Commission. “Statement of Commissioner Mary T. Boyle on Electric Bike Advance Notice of Proposed Rulemaking.” March 12, 2024. cpsc.gov